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Model of hydrogen behaviour in enamelling grade steels

Part I Theory

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Abstract

A model has been developed of the behaviour of hydrogen in enamelling-grade steels in relation to the delayed defect of blow-off of enamelled surface (fishscaling). The model is based on current theories concerning reversible and irreversible trapping of hydrogen in metallic materials. It leads to the establishment of a “free hydrogen” parameterC L which can be used to assess the susceptibility of a steel to fishscaling following the usual enamelling processess. The model can also be used to study the effect of both thermomechanical steelmaking cycles and enamelling processes on resistance to the defect.

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Abbreviations

E aD :

Activation energy of hydrogen diffusion through normal lattice

E s :

Saddle-point energy

E B :

Trap binding energy

E aT :

Trap activation energy=Es+EB

A:

Trapping site

B:

Normal lattice site

v 0 :

Vibration frequency of hydrogen at a normal lattice site

v 1 :

Vibration frequency of hydrogen at a trapping site

N L :

Density of normal lattice sites for hydrogen

N T :

Density of trapping sites for hydrogen

C L :

Concentration of hydrogen on lattice sites

C T :

Concentration of hydrogen captured on traps

k :

Probability of trapping=v0 exp(−E s/R T)

p :

Probability of detrapping =v 1 N L exp (−E aT/R T)

n :

Fraction of trapping sites occupied with hydrogen atoms among the total trapping sites=C T/N T

t :

Time

T :

Temperature

R :

Gas constant

References

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Authors and Affiliations

  1. Dipartimento di Ingegneria Chimica, Chimica Industriale e Scienza dei Materiali, Università di Pisa, Via Diotisalvi 2, 56100, Pisa, Italy

    R. Valentini, A. Solina & L. Paganini

  2. Centro Sviluppo Materiali SpA, CP 10747 Roma-EUR, 00100, Roma, Italy

    P. DeGregorio

Authors
  1. R. Valentini
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  2. A. Solina
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  3. L. Paganini
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  4. P. DeGregorio
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Valentini, R., Solina, A., Paganini, L. et al. Model of hydrogen behaviour in enamelling grade steels. J Mater Sci 27, 6579–6582 (1992). https://doi.org/10.1007/BF01165939

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  • DOI: https://doi.org/10.1007/BF01165939

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